The NanoVNA is a bit like the 'traditional' V.O.M. - Just gives readings on a meter/display.
There is/are now version(s) with connections on the PC board to add a microSD card for storage, and I believe that one of the newest versions from one of the sellers actually includes the microSD card connector already in the NanoVNA.
New owners/users should thoroughly read this group's WIKI and Files sections, but until they get frustrated with their new 'toy' and start searching the web for help, they simply don't know that this great resource even exists.
Unfortunately, we often learn of the variations after purchasing an 'early' model.
Since the makers and sellers are not large corporations, there isn't a lot of advertising and publicity about the models and features. Not even professionally written instruction manuals - although there is - now - often an included single-sheet chart of the menu system included with a new NanoVNA, but everything else is written by users.
(To be fair, it would be difficult for a very small group of the 'tech' people who develop these to also come up with thorough documentation in multiple languages!).
And then we have user enthusiasts writing new firmware versions that add even more features!
I feel so fortunate to have this resource group. And I feel sorry for all those NanoVNA users who don't know about the Group and for those who cannot read English well enough to use it. At least we do have some wonderful multi-lingual members who do provide helpful information on their own websites it other languages.
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Doug, K8RFT
